[MacPorts] #60832: py-sip: assumes macOS version is always 10.x

[MacPorts]

#60832: py-sip: assumes macOS version is always 10.x
------------------------+-----------------------
 Reporter:  ryandesign  |      Owner:  michaelld
     Type:  defect      |     Status:  assigned
 Priority:  Normal      |  Milestone:
Component:  ports       |    Version:
 Keywords:              |       Port:  py-sip
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 The py-sip Portfile contains code that assumes the macOS version will
 always be 10.x. macOS Big Sur will be version 11. Please fix the code to
 account for this.

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Ticket URL: <https://trac.macports.org/ticket/60832>
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